Diurnal Variations and Morphology of PM2.5 During Haze Period in Mueang Nakhon Sawan District, Nakhon Sawan Province
Keywords:
PM2.5, Diurnal variation, PM2.5 morphology, Biomass burningAbstract
This research investigates the diurnal variations and morphology of PM2.5 during the haze period in Mueang Nakhon Sawan District, Nakhon Sawan Province. PM2.5 concentration and meteorological data were retrieved from the Pollution Control Department (PCD) database and the Meteostat website for the period of March–April 2025. Concurrently, PM2.5 samples were collected for morphological and elemental composition analysis via scanning electron microscopy. The results indicated that PM2.5 levels exhibited diurnal variations corresponding to agricultural residue burning and heavy traffic during rush hours. Correlation analysis with meteorological data suggested that atmospheric stability significantly influenced the accumulation and dispersion of PM2.5. Morphological and elemental analysis identified biomass burning, fossil fuel combustion, and long-range transport as the primary sources of PM2.5. Furthermore, two carcinogenic heavy metals—mercury (Hg) and chromium (Cr)—were detected within the PM2.5 samples.
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